Feature/delta team/epic r04 (#7)

## Summary

epic r04 - begin refactor

## Change Type

- [x] Cowork feature
- [ ] Bug fix
- [ ] Core AI contribution
- [ ] Test / hardening
- [ ] Performance
- [ ] Documentation

## Related Work

Cowork Task:

Core Repo: http://34.143.229.138/gitea-admin/fsg-ai-core-assets

Core AI Issue:

Core Task:

Related PR:

## Scope

What is intentionally included?

What is intentionally NOT included?

## Validation

- [ ] Unit tests
- [ ] Integration tests
- [ ] Manual verification
- [ ] Regression check

Commands / evidence:

## Security Impact

Permission / credential / network / customer data impact:

## Compatibility

- [ ] No breaking change
- [ ] Breaking change documented

## Reviewer Notes

Anything Cowork reviewers should pay attention to.

---------

Co-authored-by: Anh Tran Nguyen Minh <anhtnm1@fpt.com>
Co-authored-by: Huong Le Thi Thien <huongltt35@fpt.com>
Co-authored-by: Nam Pham Dinh Thanh <nampdt@fpt.com>
Co-authored-by: Vu Dam Tuan <vudt15@fpt.com>
Co-authored-by: Hiep Ha Van <hiephv3@fpt.com>
Co-authored-by: Lam Hoang Van <lamhv7@fpt.com>
Reviewed-on: #7
Co-authored-by: Duy Le Huu <duylh19@fpt.com>

infrastructure/persistence/json/workspace_repository_impl.py

@@ -0,0 +1,58 @@
+"""WorkspaceRepository - an object-shaped, atomic-write-backed facade over
+``core/projects.py`` (R06-T02).
+"""
+from __future__ import annotations
+
+from pathlib import Path
+from typing import TYPE_CHECKING, List, Optional
+
+if TYPE_CHECKING:
+    from cowork_local.core.projects import Project
+
+
+class WorkspaceRepository:
+    """CRUD over :class:`~cowork_local.core.projects.Project`, scoped to one
+    ``directory`` (defaults to the app's real ``PROJECTS_DIR``; tests pass a
+    ``tmp_path`` so nothing touches the user's real config folder)."""
+
+    def __init__(self, directory: Optional[Path] = None) -> None:
+        """``directory`` để None thì dùng thư mục dự án mặc định; import muộn để không
+        kéo cấu hình vào lúc nạp module.
+        """
+        if directory is not None:
+            self._directory = Path(directory)
+        else:
+            from cowork_local.core.projects import PROJECTS_DIR
+            self._directory = PROJECTS_DIR
+
+    def list(self) -> List["Project"]:
+        """Liệt kê mọi project trong thư mục."""
+        from cowork_local.core.projects import list_projects
+        return list_projects(self._directory)
+
+    def get(self, project_id: str) -> Optional["Project"]:
+        """Đọc một project theo id; trả về ``None`` nếu không có."""
+        from cowork_local.core.projects import load_project
+        return load_project(project_id, self._directory)
+
+    def save(self, project: "Project") -> None:
+        """Ghi project xuống đĩa (ghi nguyên tử)."""
+        from cowork_local.core.projects import save_project
+        save_project(project, self._directory)
+
+    def create(self, name: str, **kwargs) -> "Project":
+        """Tạo project mới và ghi ngay xuống đĩa."""
+        from cowork_local.core.projects import new_project
+        return new_project(name, directory=self._directory, **kwargs)
+
+    def new(self, name: str, **kwargs) -> "Project":
+        """Bí danh của :meth:`create` — giữ cho mã cũ gọi ``new()`` vẫn chạy."""
+        return self.create(name, **kwargs)
+
+    def delete(self, project_id: str) -> bool:
+        """Xoá project; trả về ``True`` nếu có project để xoá."""
+        from cowork_local.core.projects import delete_project
+        return delete_project(project_id, self._directory)
+
+
+__all__ = ["WorkspaceRepository"]